Pin httpx to fix openai TypeError based on proxies kwarg

[kelfish]

Description

1. httpx pinned version to 0.27.2 to fix openai TypeError
2. Change how LOGFLAG is parsed from environment to ensure a real boolean is set

Pin the version of httpx in requirements to use 0.27.2. For TGI LLM which has a pinned openai dependency.

Versions of httpx from 0.28 onwards conflict with the pinned openai==1.35.13 dependency. The openai use of httpx.AsyncClient passes proxies as a kwarg, however in httpx>0.27.2 the proxies kwarg has been removed.

Without this pinned version a TypeError is thrown when calling the TGI LLM directly using OPEA ChatCompletion format:

[2024-12-13 17:28:06,723] [    INFO] - llm_tgi - [ ChatCompletionRequest ] input in opea format
INFO:     172.18.0.14:34980 - "POST /v1/chat/completions HTTP/1.1" 500 Internal Server Error
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/home/user/.local/lib/python3.11/site-packages/uvicorn/protocols/http/h11_impl.py", line 403, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.11/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.11/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/applications.py", line 113, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/middleware/errors.py", line 187, in __call__
    raise exc
  File "/home/user/.local/lib/python3.11/site-packages/starlette/middleware/errors.py", line 165, in __call__
    await self.app(scope, receive, _send)
  File "/home/user/.local/lib/python3.11/site-packages/prometheus_fastapi_instrumentator/middleware.py", line 174, in __call__
    raise exc
  File "/home/user/.local/lib/python3.11/site-packages/prometheus_fastapi_instrumentator/middleware.py", line 172, in __call__
    await self.app(scope, receive, send_wrapper)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/middleware/cors.py", line 93, in __call__
    await self.simple_response(scope, receive, send, request_headers=headers)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/middleware/cors.py", line 144, in simple_response
    await self.app(scope, receive, send)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/middleware/exceptions.py", line 62, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    raise exc
  File "/home/user/.local/lib/python3.11/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
    await app(scope, receive, sender)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/routing.py", line 715, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/routing.py", line 735, in app
    await route.handle(scope, receive, send)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/routing.py", line 288, in handle
    await self.app(scope, receive, send)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/routing.py", line 76, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    raise exc
  File "/home/user/.local/lib/python3.11/site-packages/starlette/_exception_handler.py", line 42, in wrapped_app
    await app(scope, receive, sender)
  File "/home/user/.local/lib/python3.11/site-packages/starlette/routing.py", line 73, in app
    response = await f(request)
               ^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.11/site-packages/fastapi/routing.py", line 301, in app
    raw_response = await run_endpoint_function(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.11/site-packages/fastapi/routing.py", line 212, in run_endpoint_function
    return await dependant.call(**values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/comps/llms/text-generation/tgi/llm.py", line 187, in llm_generate
    client = OpenAI(
             ^^^^^^^
  File "/home/user/.local/lib/python3.11/site-packages/openai/_client.py", line 122, in __init__
    super().__init__(
  File "/home/user/.local/lib/python3.11/site-packages/openai/_base_client.py", line 846, in __init__
    self._client = http_client or SyncHttpxClientWrapper(
                                  ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.11/site-packages/openai/_base_client.py", line 744, in __init__
    super().__init__(**kwargs)
TypeError: Client.__init__() got an unexpected keyword argument 'proxies'

Issues

n/a

Type of change

List the type of change like below. Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would break existing design and interface)
• Others (enhancement, documentation, validation, etc.)

Dependencies

httpx==0.27.2 (was previously just httpx)

Tests

Tested using built docker deployment to Gaudi 2 server in Intel Developer Cloud